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| | Abstract | | Ground-penetrating radar enables us to investigate shallow underground structure. There are mainly two points to be considered for improving the performance of GPR. First, acquired waveform of GPR changes due to the influences from the depth of investigation, physical properties of underground materials, the shape of reflectors, etc. Second, the shape and the alignment of antenna to generate EM signals give predominant influences to emitting waveforms. In this study, we use a finite difference time domain method for numerically simulating signal generation and detection to compare results from the combination of five different shapes and alignments of antennas, i.e., dipole, bowtie dual dipole, multi-dipole, and spiral arrangements. As a result, we obtained different waveforms that may characterize the difference in the arrangement of antennas. After the comparison, we confirmed that the spiral antenna gives flat spectral distribution, although the radiated power is smaller than the other antennas. |
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